"You can't actually see [the black hole]. Not the singularity itself. It's so massive, not even light can escape it. But, during the totality phase of the eclipse, we should be able to see matter spiriling towards it." "Actually, it's called the accretion disk." — Singularity ( 1 )

"The closer you get to a black hole-" "Time slows down." — A Matter of Time ( 2 )

"The time dilation is a result of the intense gravity, which is directly proportional to their proximity to the- ... Their bodies will be pulled apart by increasing tidal forces." — A Matter of Time ( 2 )

"We are witnessing something that the laws of physics say we can't possibly witness." — A Matter of Time ( 2 )

"Gravity waves. ... I assumed that the wormhole itself would insulate us from the black hole's gravitational field, but it seems that our space-time has begun to warp, just like on P3W-451." — A Matter of Time ( 2 )

"We gated to a planet that's bein sucked up by a black hole. Very bad. Very dangerous." "Why is that?" "Things tend to get sucked in." — A Matter of Time ( 2 )

"... The warping of our space-time seems to be an advance of the gravitational field rather than as a result of it. ... If it wasn't, we'd all be pulled apart by now." — A Matter of Time ( 2 )

"That planet was probably ripped to pieces. But it could take years for that matter to spiril into the event horizon. Especially given the time distortion." — Exodus ( 4 )
Companion Stars

"P3W-451 was orbiting its companion star. The orbit's probably pulling them closer and closer." — A Matter of Time ( 2 )
Coronal Mass Emissions

"According to the expanding universe model, all bodies in the universe are constantly moving further and further apart. ... The closer they are, the less difference in relative position due to expansion. The further away, the greater the difference." — Children of the Gods ( 1 )
Gravity

"Gravity is determined by mass, and mass is determined by size and composition." — Fail Safe ( 5 )
Mass

"[The shower begins] the same night every year? That doesn't make sense. I mean, unless the planet's orbit travels through a debris field like an asteroid belt-" — A Hundred Days ( 3 )

"That's what we call a near-miss. If that meteor had struck the ground instead of bouncing off of the atmosphere-" — A Hundred Days ( 3 )

"[The planet] orbits [the] sun in a big circle like this, and crosses through an asteroid belt up here at its widest point. Now, as [the planet passes] through the millions of tiny rocks and particles, some of them burn up in [the] atmosphere. ... The problem is, the asteroid belt isn't uniform. Certain orbits in certain years must pass through a denser debris field." — A Hundred Days ( 3 )
Moons

"I've been going over Dr. Thompson's astronomical observations. Did you know this moon wasn't even formed from the original accretion disk of the planet? ... Dr. Thompson thinks it was a rogue that got pulled into a highly eccentric polar orbit." — Prodigy ( 4 )
Nebula

"When the local sun sets and it gets dark, you can actually see a luminous layer of ionized gas around the dying core expanding." — Forsaken ( 6 )
Planets, magnetic fields of

"We're about to pass through the Leonids. It's a cometary trail that Earth passes through periodically." — Fail Safe ( 5 )
Stars

"[The sun is] a regular main sequence star, with a core temperature of about 15 million degrees, and enough hydrogen to burn for another 5 billion years." — Exodus ( 4 )

"Every star is a delicate balance between the explosive force of the fusion going on in its core, which tends to want to blow it apart, and the gravitational force of its mass, which tends to want to crush it into a little ball. Now, if we could disrupt that balance by suddenly removing some of the star's mass, we could create an artificial supernova." — Exodus ( 4 )
Stars, collapsing of

"We passed through an intense gravity wave from a collapsing star while in hyperspace." — Memento ( 6 )
Sun, chromosphere of

"The light from the sun suddenly shifted to the red spectrum after we got here. Now as far as I know, the only way that could happen was if an unstable superheavy element, probably Plutonium, was introduced to the sun's nuclear reaction. Sort of a sub-atomic poisoning." — Red Sky ( 5 )

"Let's say these are the unstable Plutonium molecules that are poisoning the sun. ... What if these are molecules of a more stable superheavy element, say something with an atomic weight above 200. ... Now, if we could introduce these stable superheavies into the ... sun, they would bind with the unstable Plutonium molecules, rendering them inert. The sun could then be restored to its normal nuclear reaction." — Red Sky ( 5 )
Sun, observing of